陈刚, 张晓明, 杨桂芳, 韩刚, 边军, 杨亚南, 卓胜广. 辽西地区下白垩统九佛堂组沉积与有机质发育特征[J]. 地质通报, 2019, 38(2-3): 426-436.
    引用本文: 陈刚, 张晓明, 杨桂芳, 韩刚, 边军, 杨亚南, 卓胜广. 辽西地区下白垩统九佛堂组沉积与有机质发育特征[J]. 地质通报, 2019, 38(2-3): 426-436.
    CHEN Gang, ZHANG Xiaoming, YANG Guifang, HAN Gang, BIAN Jun, YANG Ya'nan, ZHUO Shengguang. Sedimentary and organic matter characteristics of Lower Cretaceous Jiufotang Formation in western Liaoning Province[J]. Geological Bulletin of China, 2019, 38(2-3): 426-436.
    Citation: CHEN Gang, ZHANG Xiaoming, YANG Guifang, HAN Gang, BIAN Jun, YANG Ya'nan, ZHUO Shengguang. Sedimentary and organic matter characteristics of Lower Cretaceous Jiufotang Formation in western Liaoning Province[J]. Geological Bulletin of China, 2019, 38(2-3): 426-436.

    辽西地区下白垩统九佛堂组沉积与有机质发育特征

    Sedimentary and organic matter characteristics of Lower Cretaceous Jiufotang Formation in western Liaoning Province

    • 摘要: 辽西地区下白垩统九佛堂组是辽西勘探新区中生界重要的生油层位之一,其在建昌-喀左盆地分布面积广,厚206~2118m;在阜新-义县盆地中厚度相对较薄。有机地球化学分析表明,两盆地均发育有好-优质烃源岩,且有机质类型较好,整体处于低成熟演化阶段。九佛堂组二段主体为波动深湖相沉积,是烃源岩最有利发育层位,发育多套优质烃源岩,总有机碳含量平均9.5%,干酪根主要为Ⅰ型;九佛堂组一段、三段为河流-湖泊沉积体系,水体相对较浅,烃源岩发育特征较差。生物标志化合物分析表明,九佛堂组二段烃源岩形成于微咸水-半咸水、还原的湖相富粘土沉积环境。初步的成因分析表明,其形成是水体化学分层形成的良好保存条件与较高比例有机质输入共同作用的结果。

       

      Abstract: Lower Cretaceous Jiufotang Formation is one of the important source rock stratigraphic horizon in Mesozoic strata of western Liaoning Province. It is widespread in Jianchang-Kazuo Basin, with thickness of 206~2118m, but is relatively thinner in Fuxin-Yixian Basin. Organic geochemistry analyses indicate the two basins have both developed good to excellent source rocks characterized by good kerogen type and low maturity. The second section of Jiufotang Formation, which was formed in flunctuating profundal facies, is optimistic source rock horizon with average TOC of 9.5% and kerogen ofⅠtype. The first and third sections of Jiufotang Formation, which were formed in fluvial-lacustrine facies, have relatively poor source rock development environment due to shallower water body. The biomarkers analyses indicate that source rocks in the second section of Jiufotang Formation were developed in a clay-rich reducing brackish lake. The preliminary genetic analysis indicates that the development of these source rocks was attributed to good conservation condition from chemical stratification of lake water body and relatively high primary production.

       

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